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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0aa08b47163091300b05ca181c8153261a81df1853e0d9fbc9979ca3f6b8dd' 
  AND token = 'xqF/FoxzV26v3cCdO1ho/IK0mFjLcCmunpiZ08hGifk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}